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| author | Roger Sayle <roger@eyesopen.com> | 2003-09-12 15:07:50 +0000 |
|---|---|---|
| committer | Roger Sayle <sayle@gcc.gnu.org> | 2003-09-12 15:07:50 +0000 |
| commit | d2399d75150d38f714a7e55f44ac1b117896991e (patch) | |
| tree | b74dbfb654b2ba729bd9d180dd9845f8532b8c0e /gcc/rtl.h | |
| parent | f0f4da3220c5b0c14d0e88ec57ff1bc5c5e0f367 (diff) | |
| download | gcc-d2399d75150d38f714a7e55f44ac1b117896991e.zip gcc-d2399d75150d38f714a7e55f44ac1b117896991e.tar.gz gcc-d2399d75150d38f714a7e55f44ac1b117896991e.tar.bz2 | |
re PR rtl-optimization/8967 (Making class data members `const' pessimizes code)
PR optimization/8967
* alias.c (write_dependence_p): Modify to take an additional constp
argument that controls whether the UNCHANGING_RTX_P flags are used.
(anti_dependence, output_dependence): Adjust write_dependence_p
callers to pass this additional argument, to return the same result.
(unchanging_anti_dependence): New variant of anti_dependence that
ignores the UNCHANGING_RTX_P property on memory references.
* rtl.h (unchaning_anti_dependence): Prototype here.
* flow.c (init_propagate_block): Place fake constant mem writes on
the mem_set_list so that dead writes to const variables are deleted.
(insn_dead_p): Change anti_dependence to unchanging_anti_dependence.
(mark_used_regs): Likewise.
From-SVN: r71332
Diffstat (limited to 'gcc/rtl.h')
| -rw-r--r-- | gcc/rtl.h | 1 |
1 files changed, 1 insertions, 0 deletions
@@ -2253,6 +2253,7 @@ extern int canon_true_dependence (rtx, enum machine_mode, rtx, rtx, extern int read_dependence (rtx, rtx); extern int anti_dependence (rtx, rtx); extern int output_dependence (rtx, rtx); +extern int unchanging_anti_dependence (rtx, rtx); extern void mark_constant_function (void); extern void init_alias_once (void); extern void init_alias_analysis (void); |